Which dropper for Bossnut

Lowebee
Lowebee Posts: 15
edited January 2017 in MTB buying advice
Hi all, im looking to get a reverb dropper post for my Calibre Bossnut and need a little advice on sizing. I know my seatpost is 30.9mm so that dimension is sorted and im goin for a 125mm travel but the dimension i need a hand with is the overall length. My current seatpost is 350mm so would it b best to go for the 30.9mmx380mmx125mm reverb? There is also a 420mm option. I know it may sound pretty obvious to some of you but i want to get the right one. Im thinkim 380mm should b fine as i never have my seat really heigh anyway. Also ive heard that i may need a new seat clamp. Is that usually the case?

Thanks

Chris

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